quadrilateral - a flat shape with four straight sides, rhombus - a flat shape with 4 straight sides that are all equal length , rectangle - a 4 sided shape with straight sides where all interior angles are 90 degrees  , square - a flat shape with 4 straight sides where all sides have equal length and every interior angle is 90 degrees, parallelogram - a flat shape with 4 straight sides where opposite sides are parallel , area - the size of a surface, gram - a metric measure of mass (g) ( 1000 g = 1 kg) , kilogram - a metric measure of mass (kg) ( 1kg= 1000 g) , liter - a metric unit of volume, mostly used to measure liquids ,

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